51656872 has 8 divisors (see below), whose sum is σ = 96856650. Its totient is φ = 25828432.

The previous prime is 51656861. The next prime is 51656903. The reversal of 51656872 is 27865615.

It can be written as a sum of positive squares in only one way, i.e., 49364676 + 2292196 = 7026^2 + 1514^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3228547 + ... + 3228562.

Almost surely, 2^51656872 is an apocalyptic number.

It is an amenable number.

51656872 is a deficient number, since it is larger than the sum of its proper divisors (45199778).

51656872 is a wasteful number, since it uses less digits than its factorization.

51656872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6457115 (or 6457111 counting only the distinct ones).

The product of its digits is 100800, while the sum is 40.

The square root of 51656872 is about 7187.2715268035. The cubic root of 51656872 is about 372.4283230704.

The spelling of 51656872 in words is "fifty-one million, six hundred fifty-six thousand, eight hundred seventy-two".